Low Pressure Steam from Waste Heat of Updraft Gasifier

R N Singh¹ , Abhishek David² , V K Aharwal³

Section:Research Paper, Product Type: Isroset-Journal
Vol.5 , Issue.1 , pp.1-8, Jan-2019

Online published on Jan 31, 2019

Copyright © R N Singh, Abhishek David, V K Aharwal . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Waste heat of producer gas generated from a force-updraft gasifier is utilized for steam generation. Generally Producer gas released from gasifier comes under medium temperature waste heat. This gas has temperatures ranging up to 350- 450°C depending upon the design of the gasifier, type of biomass, biomass flow rate est. Theoretically, it is possible to reduce the producer gas temperature up to room temperature (25-30°C). The producer gas temperature does not help to increase the energy content of gas. Thus to harness the heat of producer gas a pipe to pipe counter flow heat exchanger was designed, developed and used for waste heat recovery of gas. Hot producer gas flows in inner pipe and water flows in annulus of heat exchanger, in counter current manner. Low pressure steam was generated due to heat transfer between water and hot producer gas. Various parameters such as heat transfer coefficient of producer gas, water, surface temperature of producer gas carrying pipe of heat exchanger, mass flow rate of steam est. are calculated theoretically at mean outlet temperature of producer gas and results are compared with practical values of parameters obtained during gasifier run. On an average about 3.5 L/h water is converted into low pressure steam at an atmospheric pressure from waste heat of producer gas.

Key-Words / Index Term :
Updraft gasifier, Biomass, heat exchanger, waste heat, Low pressure steam

References :
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